From f8c0aca9fda7856a8a8d61d523ba3187affbd714 Mon Sep 17 00:00:00 2001 From: Fabio Estevam Date: Sat, 20 Jul 2013 16:20:36 -0300 Subject: fec: Add MODULE_ALIAS Add MODULE_ALIAS, so that auto module loading can work. Signed-off-by: Fabio Estevam Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/fec_main.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/net/ethernet/freescale/fec_main.c') diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index d3ad5ea711d3..f0f0e96453a0 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -2279,4 +2279,5 @@ static struct platform_driver fec_driver = { module_platform_driver(fec_driver); +MODULE_ALIAS("platform:"DRIVER_NAME); MODULE_LICENSE("GPL"); -- cgit v1.2.3-59-g8ed1b From 031916568a1aa2ef1809f86d26f0bcfa215ff5c0 Mon Sep 17 00:00:00 2001 From: Frank Li Date: Thu, 25 Jul 2013 14:05:53 +0800 Subject: net: fec: workaround stop tx during errata ERR006358 If the ready bit in the transmit buffer descriptor (TxBD[R]) is previously detected as not set during a prior frame transmission, then the ENET_TDAR[TDAR] bit is cleared at a later time, even if additional TxBDs were added to the ring and the ENET_TDAR[TDAR] bit is set. This results in frames not being transmitted until there is a 0-to-1 transition on ENET_TDAR[TDAR]. Workarounds: code can use the transmit frame interrupt flag (ENET_EIR[TXF]) as a method to detect whether the ENET has completed transmission and the ENET_TDAR[TDAR] has been cleared. If ENET_TDAR[TDAR] is detected as cleared when packets are queued and waiting for transmit, then a write to the TDAR bit will restart TxBD processing. This case main happen when loading is light. A ethernet package may not send out utile next package put into tx queue. How to test: while [ true ] do ping -s 10000 -w 4 ping -s 6000 -w 2 ping -s 4000 -w 2 ping -s 10000 -w 2 done You will see below result in overnight test. 6008 bytes from 10.192.242.116: seq=1 ttl=128 time=0.722 ms 4008 bytes from 10.192.242.116: seq=0 ttl=128 time=1001.008 ms 4008 bytes from 10.192.242.116: seq=1 ttl=128 time=1.010 ms 10008 bytes from 10.192.242.116: seq=0 ttl=128 time=0.896 ms After apply this patch, >1000ms delay disappear. Signed-off-by: Frank Li Acked-by: Fugang Duan Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/fec.h | 1 + drivers/net/ethernet/freescale/fec_main.c | 32 +++++++++++++++++++++++++++++-- 2 files changed, 31 insertions(+), 2 deletions(-) (limited to 'drivers/net/ethernet/freescale/fec_main.c') diff --git a/drivers/net/ethernet/freescale/fec.h b/drivers/net/ethernet/freescale/fec.h index 2b0a0ea4f8e7..ae236009f1a8 100644 --- a/drivers/net/ethernet/freescale/fec.h +++ b/drivers/net/ethernet/freescale/fec.h @@ -259,6 +259,7 @@ struct bufdesc_ex { struct fec_enet_delayed_work { struct delayed_work delay_work; bool timeout; + bool trig_tx; }; /* The FEC buffer descriptors track the ring buffers. The rx_bd_base and diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index f0f0e96453a0..0dda45481d16 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -93,6 +93,20 @@ static void set_multicast_list(struct net_device *ndev); #define FEC_QUIRK_HAS_CSUM (1 << 5) /* Controller has hardware vlan support */ #define FEC_QUIRK_HAS_VLAN (1 << 6) +/* ENET IP errata ERR006358 + * + * If the ready bit in the transmit buffer descriptor (TxBD[R]) is previously + * detected as not set during a prior frame transmission, then the + * ENET_TDAR[TDAR] bit is cleared at a later time, even if additional TxBDs + * were added to the ring and the ENET_TDAR[TDAR] bit is set. This results in + * If the ready bit in the transmit buffer descriptor (TxBD[R]) is previously + * detected as not set during a prior frame transmission, then the + * ENET_TDAR[TDAR] bit is cleared at a later time, even if additional TxBDs + * were added to the ring and the ENET_TDAR[TDAR] bit is set. This results in + * frames not being transmitted until there is a 0-to-1 transition on + * ENET_TDAR[TDAR]. + */ +#define FEC_QUIRK_ERR006358 (1 << 7) static struct platform_device_id fec_devtype[] = { { @@ -112,7 +126,7 @@ static struct platform_device_id fec_devtype[] = { .name = "imx6q-fec", .driver_data = FEC_QUIRK_ENET_MAC | FEC_QUIRK_HAS_GBIT | FEC_QUIRK_HAS_BUFDESC_EX | FEC_QUIRK_HAS_CSUM | - FEC_QUIRK_HAS_VLAN, + FEC_QUIRK_HAS_VLAN | FEC_QUIRK_ERR006358, }, { .name = "mvf600-fec", .driver_data = FEC_QUIRK_ENET_MAC, @@ -275,7 +289,7 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev) struct fec_enet_private *fep = netdev_priv(ndev); const struct platform_device_id *id_entry = platform_get_device_id(fep->pdev); - struct bufdesc *bdp; + struct bufdesc *bdp, *bdp_pre; void *bufaddr; unsigned short status; unsigned int index; @@ -370,6 +384,15 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev) ebdp->cbd_esc |= BD_ENET_TX_PINS; } } + + bdp_pre = fec_enet_get_prevdesc(bdp, fep->bufdesc_ex); + if ((id_entry->driver_data & FEC_QUIRK_ERR006358) && + !(bdp_pre->cbd_sc & BD_ENET_TX_READY)) { + fep->delay_work.trig_tx = true; + schedule_delayed_work(&(fep->delay_work.delay_work), + msecs_to_jiffies(1)); + } + /* If this was the last BD in the ring, start at the beginning again. */ if (status & BD_ENET_TX_WRAP) bdp = fep->tx_bd_base; @@ -689,6 +712,11 @@ static void fec_enet_work(struct work_struct *work) fec_restart(fep->netdev, fep->full_duplex); netif_wake_queue(fep->netdev); } + + if (fep->delay_work.trig_tx) { + fep->delay_work.trig_tx = false; + writel(0, fep->hwp + FEC_X_DES_ACTIVE); + } } static void -- cgit v1.2.3-59-g8ed1b From a264b981f2c76e281ef27e7232774bf6c54ec865 Mon Sep 17 00:00:00 2001 From: Uwe Kleine-König Date: Tue, 30 Jul 2013 11:29:40 +0200 Subject: net/fec: Don't let ndo_start_xmit return NETDEV_TX_BUSY without link MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Don't test for having link and let hardware deal with this situation. Without this patch I see a machine running an -rt patched Linux being stuck in sch_direct_xmit when it looses link while there is still a packet to be sent. In this case the fec_enet_start_xmit routine returned NETDEV_TX_BUSY which makes the network stack reschedule the packet and so sch_direct_xmit calls fec_enet_start_xmit again. I failed to reproduce a complete hang without -rt, but I think the problem exists there, too. Signed-off-by: Uwe Kleine-König Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/fec_main.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'drivers/net/ethernet/freescale/fec_main.c') diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c index 0dda45481d16..77ea0db0bbfc 100644 --- a/drivers/net/ethernet/freescale/fec_main.c +++ b/drivers/net/ethernet/freescale/fec_main.c @@ -294,11 +294,6 @@ fec_enet_start_xmit(struct sk_buff *skb, struct net_device *ndev) unsigned short status; unsigned int index; - if (!fep->link) { - /* Link is down or auto-negotiation is in progress. */ - return NETDEV_TX_BUSY; - } - /* Fill in a Tx ring entry */ bdp = fep->cur_tx; -- cgit v1.2.3-59-g8ed1b